HP-UX Reference (11i v3 07/02) - 3 Library Functions N-Z (vol 7)

pthread_once(3T) pthread_once(3T)

(Pthread Library)

For a multithreaded process, a simple initialization ﬂag is not sufﬁcient; the ﬂag must be protected against

modiﬁcation by multiple threads. Consequently, this ﬂag has to be protected by a mutex that has to be ini-

tialized only once, and so on. A multithreaded program should use initialization similar to:

static pthread_once_t once_control = PTHREAD_ONCE_INIT;

extern void initialize();

(void)pthread_once(&once_control, initialize);

(Rest of the code after initialization.)

AUTHOR

pthread_once()

was derived from the IEEE POSIX P1003.1c standard.